Chapter 2: Performance; Overview; Motor Trim; Bow Up Condition - World Cat 2009 boat Owner's Manual

OVERVIEW

This chapter will provide information on the performance characteristics of your catamaran; This is
not a substitute for seamanship training or hands-on experience. First time boat owners should use the
resources detailed in Chapter 1 to learn proper methods of boat operation. Experienced boaters who have
never owned a catamaran, should study this chapter completely. Do not assume that previous boating expe-
rience will apply to all situations, as there are several subtle differences in the handling characteristics of
twin hulled boats. For existing catamaran owners, this chapter should be a reference.

MOTOR TRIM

The smooth riding characteristics of a catamaran are a result of the twin hull design. Their ability to
slice through oncoming waves is far superior to the slamming characteristics seen on conventional vessels.
Motor trim plays an integral part in how your catamaran accomplishes this. In a level or bow down atti-
tude, your boat will slice through larger chop but you may experience sluggish performance, a wetter ride
and increased bow steering in a following sea. In a bow up attitude the boat will perform better, but may
ride less smoothly. Experiment with the trim settings in various sea conditions to determine what you are
most comfortable with. When using the trim to correct a listing condition, imagine an "X" connecting the
starboard engine to the port bow, and port engine to the starboard bow (see drawing below).

BOW UP CONDITION

To correct a bow up condition on the port sponson,
adjust the motor trim "down" on the starboard
engine. This will help the starboard sponson to rise
and level the vessel. If moving to the lowest trim set-
ting on the starboard engine does not correct the list,
trim the port engine "up" to assist the change.
Reverse the instructions to accommodate for a bow
up condition on the starboard sponson.

BOW DOWN CONDITION

To correct a bow down condition on the port spon-
son, adjust the motor trim "up" on the starboard
engine. This will help the starboard sponson to fall
and level the vessel. If cavitation occurs on the star-
board engine, lower it to correct the problem, then
trim the port engine "down" to assist the change.
Reverse the instructions to accommodate for a bow
down condition on the starboard sponson.
CHAPTER 2
PERFORMANCE
2-1
World Cat